Back when qualifications were shot with low bid 38 reloads... invariably soft swaged bullets. I learned to wipe down the gun inside and out... with BreakFree CLP before shooting. Especially bore and chambers. A "wet" patch then a "dry" patch leaving just a film. The fouling would be on top of the film and almost wipe off with a paper towel. I think I learned the trick from a gun mag... most likely Am. Handgunner.
After our Armourer (and friend) saw me do it. He tried it. At the next qualification, BreakFree was available in a pump sprayer.

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NRA LIFE
Reserve Officer 9yrs